JPH10184815A - Double row type chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a double row type chain to reduce noise at the time when the chain is used. SOLUTION: In a double row type chain which is provided with a pair of inner plate having a first hole at one end part in the longitudinal direction and having a second hole at the other end part, an inner link consisting of two bushes, both ends of which are inserted into the respective first hole and second hole, an outer plate having the first insertion hole at one end part in the longitudinal direction and having the second insertion hole at the other end part, an intermediate plate having the first through hole at one end part in the longitudinal direction and having the second through hole at the other end part, and one outer plate, an inner link, an intermediate plate, and the other inner link, the other outer plate, are alternately shifted and overlapped with each other, and then pins are inserted into the insertion holes of the one outer plate into the inner cylinder of the respective bushes of the inner link, and the respective through holes of the intermediate plate in order for a double row type chain to be formed, a part between the first through hole and the second through hole of the intermediate plate 15 is removed to provide a space part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-row chain, and more particularly to a double-row timing chain for transmitting a driving force of a camshaft, an oil pump, and the like of an internal combustion engine.

[0002]

2. Description of the Related Art In an internal combustion engine, a timing chain is used as means for transmitting the rotational force of a crankshaft to an oil pump or a camshaft. Since the timing chain is a component related to the crankshaft, the camshaft, and the like, which are the most important parts of the internal combustion engine, high durability is required. As a timing chain that achieves high durability, a double-row chain is known.

The double-row chain has a pair of inner plates having a first hole at one end in a longitudinal direction and a second hole at the other end, and a space between the first holes of each of the inner plates and each of the inner plates. An intermediate plate having an inner link composed of a cylindrical bush provided between the second holes and having a first through hole at one end in the longitudinal direction and a second through hole at the other end; And an outer plate having a first insertion hole at one end and a second insertion hole at the other end.

The one outer plate, the one inner link, the intermediate plate, the other inner link, and the other outer plate are alternately shifted and overlapped to form a second insertion hole of the one outer plate, Pins are inserted into the inner cylinder of the first hole side bush of the link, the second through hole of the intermediate plate, the inner cylinder of the first hole side bush of the other inner link, and the second insertion hole of the other outer plate. Multiple units are formed.

Further, a first insertion hole of one outer plate of one unit, an inner cylinder of a second hole side bush of an inner link of another unit, a first through hole of an intermediate plate of the one unit, A pin is inserted into the inner cylinder of the second hole side bush of the other inner link of the other unit and the first insertion hole of the other outer plate of the one unit to connect the one unit and the other unit. Connecting and repeating this connection forms a double row chain.

[0006] The double-row chain thus formed is
The gear meshes with a double-row gear to transmit the rotational force of the gear to another gear. At this time, the double-row chain receives the rotational force of the gear by two inner links, one inner link and the other inner link, so that the load on one inner link can be reduced, and Achieve durability.

[0007]

Although the conventional double-row chain realizes high durability, it is heavier than the single-row chain, so that the noise during use is lower than that of the single-row chain. There is a problem that is large.

[0008] The present invention has been made in view of the above problems, and has as its object to reduce the weight of a double-row chain and reduce noise.

[0009]

The present invention employs the following means in order to solve the above-mentioned problems. That is,
The double-row chain according to the present invention has a pair of inner plates having a first hole at one end in the longitudinal direction and a second hole at the other end, between the first holes of each of the inner plates, and An intermediate plate having an inner link composed of a cylindrical bush provided between the second holes and having a first through hole at one end in the longitudinal direction and a second through hole at the other end; Has a first insertion hole at one end thereof,
An outer plate having a second insertion hole at the other end,
One outer plate, one inner link, an intermediate plate, another inner link, and another outer plate are alternately shifted and overlapped, and a second insertion hole of the one outer plate and a first hole of the one inner link are provided. A plurality of units each having a pin inserted into the inner cylinder of the side bush, the second through hole of the intermediate plate, the inner cylinder of the first hole side bush of the other inner link, and the second insertion hole of the other outer plate; A first insertion hole of one outer plate of one unit, an inner cylinder of a second hole side bush of an inner link of another unit, a first through hole of an intermediate plate of the one unit, A pin is inserted into the inner cylinder of the second hole-side bush of the other inner link of the unit and the first insertion hole of the other outer plate of the one unit to insert the one unit and the other unit. Connecting the Tsu bets, the double-row type chain formed by repeating this connection, characterized in that a space portion to remove between the first through-hole and the second through hole of the intermediate plate. The present invention is based on the inventor's finding that most of the load applied to a double-row chain is applied to two outer plates and two inner links of each unit, and almost no load is applied to an intermediate plate.

For example, when a load is applied to a double-row timing chain, one unit receives a tensile stress from a first unit in which one outer plate and another outer plate are connected to one end, and The stress is transmitted to one inner link and another inner link via a pin provided between the second insertion hole of the outer plate and the second insertion hole of another outer plate.

[0011] The stress transmitted to one inner link and the other inner link is equal to the stress of the second inner link connected to the other end.
To the one outer plate and the other outer plate of the second unit via a pin provided between the first insertion hole of the one outer plate of the unit and the first insertion hole of the other outer plate. Convey.

As described above, most of the stress transmitted between the units is covered by the two outer plates and the two inner links. Therefore, as described above, the space between the first through hole and the second through hole of the intermediate plate of each unit can be deleted without any problem in durability. Since each unit is reduced in weight by removing the space between the first through hole and the second through hole of the intermediate plate of each unit, the weight of the entire double-row chain is significantly reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a double-row chain according to the present invention will be described below with reference to FIGS. In the present embodiment, a double-row timing chain will be described as an example of a double-row chain.

As shown in FIG. 2, the double-row timing chain shifts the first outer plate 8, the first inner link 7a, the intermediate plate 15, the second inner link 7b, and the second outer plate 9 alternately. The unit 16 is formed by connecting a plurality of units 16 that are formed by overlapping each other.

The first and second outer plates 8 and 9
Is a plate having a first insertion hole 10 formed at one end in the longitudinal direction and a second insertion hole 11 formed at the other end, as shown in FIG.

The first and second inner links 7a, 7
Each of b includes a first inner plate 1, a second inner plate 2, and two bushes 5, 6. As shown in FIG. 4, the first and second inner plates 1 and 2 are plates having a first hole 3 formed at one end in a longitudinal direction and a second hole 4 formed at the other end. The bushes 5 and 6 are formed by bending a plate material into a tubular shape so that both end surfaces thereof abut. Then, the bushes 5 and 6 are provided between the first holes 3 and between the second holes 4 of the first and second inner plates 1 and 2, and the first and second inner links 7a and 7b are provided. Is formed.

As shown in FIG. 1, the intermediate plate 15 is a plate having a long hole 17 formed along the longitudinal direction. The long hole 17 realizes a first through hole, a second through hole, and a space according to the present invention.

As shown in FIG. 5, the unit 16 includes a first outer plate 8 and a first inner link 7.
a, the intermediate plate 15, the second inner link 7b, and the second
The outer plate 9 is alternately shifted and overlapped, and the second insertion hole 11 of the first outer plate 8, the inner cylinder of the first hole side bush 5 of the first inner link 7a, and the elongated hole 17 of the intermediate plate 15 are formed. The other end of the second inner link 7b is aligned with the inner cylinder of the first hole side bush 5 of the second inner link 7b and the second insertion hole 11 of the second outer plate 9, and the pin 13 is inserted.
Both ends of the pin 13 are fixed to the first and second outer plates 8 and 9.

Subsequently, the first insertion hole 10 of the first outer plate 8 of one unit 16 and the first insertion hole 10 of the other unit 16
The inner cylinder of the second hole side bush 6 of the inner link 7a, one end of the elongated hole 17 of the intermediate plate 15 of the one unit 16, and the second inner link 7 of the other unit 16;
b, the inner cylinder of the second hole side bush 6 and the one unit 1
6 and the first insertion hole 10 of the second outer plate 9 is aligned with the first insertion hole 10, the pin 12 is inserted, and both ends of the pin 12 are fixed to the first and second outer plates 8 and 9 of the unit. The one unit 16 and the other unit 16 are connected, and the connection is repeated to form a double-row timing chain. Hereinafter, the operation and effect of the double-row timing chain according to the present embodiment will be described.

The double-row timing chain meshes with the double-row gear and transmits the rotational force of the gear to another gear. At this time, the double-row timing chain includes the second hole-side bush 6 (or the first hole-side bush 5) of the first inner link 7a and the second hole-side bush 6 (or the first hole-side bush 5) of the second inner link 7b. It receives the force from the gear via the bush 5). The force received by the first and second inner links 7a and 7b is applied to the first hole side bush 5 (or the second hole) through the first and second inner plates 1 and 2 of the inner links 7a and 7b. To the side bush 6).

The force transmitted to the first hole-side bush 5 (or the second hole-side bush 6) is applied to a pin inserted into the inner cylindrical portion of the first hole-side bush 5 (or the second hole-side bush 6). 12 (or pin 13)
The power is transmitted to the outer plates 8 and 9 and the intermediate plate 15. Here, FIG. 6 shows the result of measuring the tension applied to the first and second outer plates and the tension applied to the intermediate plate of a certain unit. This measurement was performed on a double-row timing chain using an outer plate having a thickness of 1.15 mm and an intermediate plate having a thickness of 1.6 mm.

In FIG. 6, the graphs of FIG.
The graph shows the sum of the tension applied to the outer plate, and the graph indicates the tension applied to the intermediate plate. When a low tension of 0 to 100 kgf is applied to the double-row timing chain, almost all of the tension is applied to the two outer plates, and is hardly applied to the intermediate plate.

Subsequently, when the tension applied to the double-row timing chain is gradually increased from 100 kgf, about 80% of the tension is applied to the two outer plates, and the remaining about 20% is applied to the intermediate plate. ing. From this measurement result, it is understood that the intermediate plate receives almost no stress. Next, a first through hole is provided at one end in the longitudinal direction,
Using an intermediate plate having a second through hole at the other end,
FIG. 7 shows the result of measuring the stress applied to the portion located between the first through hole and the second through hole. This measurement was performed on a stress applied to a portion located on a vertical bisector of a line connecting the center of the first through hole and the center of the second through hole in the intermediate plate having a thickness of 1.60 mm. The vertical axis in the figure represents the distance (mm) from the midpoint of the line connecting the center of the first through hole and the center of the second through hole to the measurement point, and the horizontal axis represents the stress in the longitudinal direction at the measurement point. Show.

In FIG. 7, the graph shows the measurement result when no tension is applied to the intermediate plate, the graph shows the measurement result when the tension of 108 kgf is applied to the intermediate plate, and the graph shows the measurement result when the tension is applied to the intermediate plate. 243 kg
The graph shows the measurement results when a tension of 400 kgf was applied to the intermediate plate.

According to the above graphs, almost no stress is applied to the portion near the intermediate point, and a greater stress is applied to a portion farther from the intermediate point, that is, a portion closer to the end in the short direction. You can see that it is hanging. From the measurement results shown in FIGS. 6 and 7 above, the load of the timing chain is hardly applied to the intermediate plate, and most of the load applied to the intermediate plate is located near the short end of the intermediate plate. It turns out that it takes. Therefore, even if the space located between the first through hole and the second through hole of the intermediate plate is removed to form a space, it can be said that the strength of the intermediate plate is hardly reduced.

As a result, if the long holes 17 are formed in the intermediate plate as shown in the present embodiment, the weight of the intermediate plate can be reduced without reducing the strength of the intermediate plate. Further, by reducing the weight of the intermediate plate, the weight of the entire double-row timing chain can be significantly reduced, and the noise caused by the use of the double-row timing chain can be reduced. The intermediate plate 15 according to the present embodiment has a pin 1 at one end of the long hole 17.
2 and the pin 13 at the other end, a space is formed at the center of the long hole 17, and this space facilitates the introduction of lubricating oil from outside the timing chain into the timing chain. The wear resistance of the timing chain can also be improved.

[0027]

According to the double-row chain according to the present invention, it is possible to reduce the weight of the intermediate plate without reducing the strength of the intermediate plate. As a result, the weight of the double-row chain can be reduced without lowering the durability of the double-row chain, and noise during use can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an intermediate plate.

FIG. 2 is a plan view of a double-row timing chain according to the embodiment;

FIG. 3 is a diagram showing a configuration of an outer plate.

FIG. 4 is a diagram showing a configuration of an inner plate.

FIG. 5 is a diagram showing a configuration of a unit 16;

FIG. 6 is a view showing a result of measuring a tension applied to an outer plate and an intermediate plate.

FIG. 7 is a view showing a result of measuring a stress applied to an intermediate plate.

[Explanation of symbols]

 1 1st inner plate 2 2nd inner plate 3 1st hole 4 2nd hole 5 bush 6 bush 7 inner link 8 1st outer plate 9th 2 outer plate 10 first insertion hole 11 second insertion hole 12 pin 13 pin 15 intermediate plate 16 unit 17 long hole

Claims (1)

[Claims] 1. A pair of inner plates having a first hole at one end in a longitudinal direction and a second hole at the other end, between a first hole and a second hole of each inner plate. An intermediate plate having a first through hole at one end in the longitudinal direction and a second through hole at the other end; and an intermediate plate at one end in the longitudinal direction. An outer plate having one insertion hole and a second insertion hole at the other end is provided, wherein one outer plate, one inner link, an intermediate plate, another inner link, and another outer plate are alternately shifted. Overlapping, the second insertion hole of the one outer plate, the inner cylinder of the first hole side bush of the one inner link, the second through hole of the intermediate plate, and the first hole side bush of the other inner link. Inner cylinder A plurality of units each having a pin inserted into the second insertion hole of the other outer plate, a first insertion hole of one outer plate of one unit, and a second hole-side bush of one inner link of another unit. Inner cylinder, the first through hole of the intermediate plate of the one unit, the inner cylinder of the second hole side bush of the other inner link of the other unit, and the first insertion of the other outer plate of the one unit A pin is inserted into the hole to connect the one unit and the other unit, and in a double-row chain formed by repeating this connection, a space between the first through hole and the second through hole of the intermediate plate is provided. A double-row chain characterized by providing a space by removing it.